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Business Segment Information - Summary of Net Sales of Company Recognized at a Point in Time Versus Over Time (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jul. 02, 2022
Jul. 03, 2021
Jul. 02, 2022
Jul. 03, 2021
Disaggregation of Revenue [Line Items]        
Total net sales $ 714,319 $ 681,647 $ 1,404,891 $ 1,290,192
Chemistry Consumables [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 131,947 126,459 257,565 245,433
Service [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 244,689 240,692 484,421 467,215
Net Sales Recognized at a Point in Time: [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 561,201 529,787 1,097,820 991,096
Net Sales Recognized at a Point in Time: [Member] | Instrument Systems [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 337,683 314,496 662,905 577,544
Net Sales Recognized at a Point in Time: [Member] | Chemistry Consumables [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 131,947 126,459 257,565 245,433
Net Sales Recognized at a Point in Time: [Member] | Service [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 91,571 88,832 177,350 168,119
Net Sales Recognized Over Time: [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales 714,319 681,647 1,404,891 1,290,192
Net Sales Recognized Over Time: [Member] | Service [Member]        
Disaggregation of Revenue [Line Items]        
Total net sales $ 153,118 $ 151,860 $ 307,071 $ 299,096